fix: queue busy bot delegations

[lightcloud00]

Refs lightcloud00/claudecode-workspace#1330

What changed

• give each delegation a stable SHA-256 task ID and deduplicate repeated pending requests
• persist busy-target lifecycle state, bounded retry attempts, age limits, and machine-readable terminal reasons
• drain eligible work from turn.completed events without polling or weakening the one-hop and peer-approval guards
• record queue, completion, and failure transitions in the existing decision ledger without prompt or provider-output content
• preserve queued work across restart and retain the existing channel-visible success and failure record

Why

A temporarily busy bot previously caused a valid handoff to be canceled. The new lifecycle keeps exactly one durable task, retries only from completion events, and reports whether it is queued, completed, or permanently failed.

How it was verified

• pnpm typecheck passed under Node 26.4.0
• pnpm test passed: 1,693 tests counted (1,680 passed, 13 skipped), above the 1,070 floor
• broker, updater, desktop-viewer, packaged-server, and all eight packaged proxy-path checks passed
• focused delegation, agents-proxy, and comms suites passed: 54 tests
• git diff --check passed

Screenshots (UI changes)

Not applicable; this changes server orchestration and audit behavior only.

Checklist

• pnpm typecheck and pnpm test pass locally
• Server behavior changes come with tests
• No dist-server/ edits
• No platform-specific shell construction added
• No secrets in logs, responses, events, or argv

This PR remains a draft and does not activate or release an installed app.

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